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Look at the top of this forum under the stickie Norcold and Dometic for service manual, etc. You can use either one for a basic troubleshooting sequence to determine your issue. If you will give us more info and model numbers we may be able to help you more.

To see if the unit will even run on a manual bypass mode, track down the power to the 120 vac heater element on the frig. Track back to the control board and disconnect these two wires. Carefully gig up an extension so that you can safely plug the cord into a 120 volt outlet that has power to it. Shut off the frig at the control panel.

What you are doing is bypassing all of the controls. Let it run at least 12 hours like this and preferably longer. Place a thermometer in the freezer and the frig. Check the temp after 12 and 24 hours. The frig should get down to 35 to 38 degF and the freezer down to at least 0 degF.

If it gets cold, the unit is working and the problem is the controller board. replace the control board with a Dinosaur board and not the OEM board.

If it is not cooling, you need to check the heater element with a volt-ohm meter. If it checks bad, replace the element ant try the bypass run again.

If it does not get cold at all after all of this....time for a new cooling unit.